What is this?

Matt says I brought this home and planted this. I must be losing my mind, because I don't remember buying it or planting it. I think it's a weed.
The only thing I can think of... is one day I was at a nursery looking at some oregano, but I don't think I even bought that plant that day. And from the pictures I looked up online, it doesn't look like oregano. Anyhow, it doesn't smell, and i'm thinking of just ripping it out.
What is it?

I'll take some tomorrow. Sorry took this too late in the evening.
Anyhow, I think Matt is just trying to play a trick on me, and every time I tell him I'm ripping it out, he says, "you bought it, now leave it there."